181749109918 has 4 divisors (see below), whose sum is σ = 272623664880. Its totient is φ = 90874554958.

The previous prime is 181749109907. The next prime is 181749109957. The reversal of 181749109918 is 819901947181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45437277478 + ... + 45437277481.

It is an arithmetic number, because the mean of its divisors is an integer number (68155916220).

Almost surely, 2^181749109918 is an apocalyptic number.

181749109918 is a deficient number, since it is larger than the sum of its proper divisors (90874554962).

181749109918 is an equidigital number, since it uses as much as digits as its factorization.

181749109918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90874554961.

The product of its (nonzero) digits is 1306368, while the sum is 58.

The spelling of 181749109918 in words is "one hundred eighty-one billion, seven hundred forty-nine million, one hundred nine thousand, nine hundred eighteen".